Submission #18731

#	Time	Username	Problem	Language	Result	Execution time	Memory
18731		suhgyuho_william	Crayfish scrivener (IOI12_scrivener)	C++98	34 / 100	1000 ms	8888 KiB

scrivener

int rear;
int a[1000010];
int ans[1000010];

void Init(){
	rear = -1;
}

void TypeLetter(char L) {
	rear++;
	a[rear] = -(L-'a'+1);
}

void UndoCommands(int U) {
	rear++;
	a[rear] = U;
}

char GetLetter(int P) {
	int i,cnt;

	cnt = -1;
	for(i=rear; i>=0; i--){
		if(a[i] < 0){
			ans[++cnt] = -a[i];
		}else{
			i = i-a[i];
		}
	}
	return ans[cnt-P]+'a'-1;
}

• Subtask 1: 5 / 5
• Subtask 2: 7 / 7
• Subtask 3: 22 / 22
• Subtask 4: 0 / 26
• Subtask 5: 0 / 40